Prepare for #2755 - Dockerfile only

Only the Dockerfile for now as discussed with @michi-covalent because it
will diverge everytime

taken from the original commit:

--
This way we are not diverging in multiple dockerfiles and we can choose
between two targets:
- cilium-cli-ci The original target based on ubuntu and the default
- cilium-cli Only contains the cilium cli based on scratch
--

Signed-off-by: Merijn Keppel <[email protected]>

Author: leppeK

Diff for: Dockerfile

@@ -3,32 +3,41 @@
 # Copyright Authors of Cilium
 # SPDX-License-Identifier: Apache-2.0
 
+# FINAL_CONTAINER specifies the source for the output
+# cilium-cli-ci (default) is based on ubuntu with cloud CLIs
+# cilium-cli is from scratch only including cilium binaries
+ARG FINAL_CONTAINER="cilium-cli-ci"
+
 FROM docker.io/library/golang:1.23.1-alpine3.19@sha256:e0ea2a119ae0939a6d449ea18b2b1ba30b44986ec48dbb88f3a93371b4bf8750 AS builder
 WORKDIR /go/src/github.com/cilium/cilium-cli
 RUN apk add --no-cache curl git make ca-certificates
 COPY . .
 RUN make
 
-FROM ubuntu:24.04@sha256:dfc10878be8d8fc9c61cbff33166cb1d1fe44391539243703c72766894fa834a
-LABEL maintainer="[email protected]"
-WORKDIR /root/app
+FROM scratch AS cilium-cli
+COPY --from=builder /go/src/github.com/cilium/cilium-cli/cilium /usr/local/bin/cilium
+
+FROM ubuntu:24.04@sha256:dfc10878be8d8fc9c61cbff33166cb1d1fe44391539243703c72766894fa834a AS cilium-cli-ci
 COPY --from=builder /go/src/github.com/cilium/cilium-cli/cilium /usr/local/bin/cilium
 
 # Install cloud CLIs. Based on these instructions:
 # - https://cloud.google.com/sdk/docs/install#deb
 # - https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html
 # - https://learn.microsoft.com/en-us/cli/azure/install-azure-cli-linux?pivots=apt#install-azure-cli
 RUN apt-get update -y \
- && apt-get install -y curl gnupg unzip \
- && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | gpg --dearmor -o /usr/share/keyrings/cloud.google.gpg \
- && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - \
- && echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list \
- && apt-get update -y \
- && apt-get install -y google-cloud-cli google-cloud-sdk-gke-gcloud-auth-plugin kubectl \
- && curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" \
- && unzip awscliv2.zip \
- && ./aws/install \
- && rm -r ./aws awscliv2.zip \
- && curl -sL https://aka.ms/InstallAzureCLIDeb | bash
+  && apt-get install -y curl gnupg unzip \
+  && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | gpg --dearmor -o /usr/share/keyrings/cloud.google.gpg \
+  && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - \
+  && echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list \
+  && apt-get update -y \
+  && apt-get install -y google-cloud-cli google-cloud-sdk-gke-gcloud-auth-plugin kubectl \
+  && curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" \
+  && unzip awscliv2.zip \
+  && ./aws/install \
+  && rm -r ./aws awscliv2.zip \
+  && curl -sL https://aka.ms/InstallAzureCLIDeb | bash
 
-ENTRYPOINT []
+FROM ${FINAL_CONTAINER} 
+LABEL maintainer="[email protected]"
+WORKDIR /root/app
+ENTRYPOINT ["/usr/local/bin/cilium"]